Stone guide · stones, plainly
Learn about sapphire
Corundum in every color but red, a 9 on the Mohs scale, hard enough for every day.
- The facts
- Stone facts
- Mineral family
- Corundum
- Hardness
- 9 / 10 Mohs
- Birthstone
- Sep.
- Anniversary
- 5th & 45th
The mineral
Corundum, the second hardest thing nature makes. Sapphire is every color corundum comes in except red; the red ones are called ruby.
In the hand
At 9 / 10 on the Mohs scale it is heirloom-hard: wear it every day for a lifetime and let the metal show the years instead.
Treatment, plainly
Untreated unless its passport says otherwise. When a stone of ours is heated, the passport says heated, in that word, and the price reflects it.
Choosing one
Photographs flatter and light booths lie. We choose sapphire in north daylight, loose, against ivory paper, and we would rather show you two honest stones than twenty pretty pictures. Corundum in every color but red, a 9 on the Mohs scale, hard enough for every day.
Care
Warm water, a drop of dish soap, a soft brush. Store it in its own pouch; it will scratch softer stones sooner than they scratch it.
Asked about sapphire
Is sapphire right for daily wear?
At 9 / 10 on the Mohs scale it is heirloom-hard: wear it every day for a lifetime and let the metal show the years instead.
Is it treated?
Untreated unless its passport says otherwise. When a stone of ours is heated, the passport says heated, in that word, and the price reflects it.
What does it cost here?
Current works with this stone start at $6,400. Every piece is one of a kind, so prices move with the stone, never with a formula.
How do I know what I am buying?
Every stone that leaves the studio carries a passport: species, carat, cut, origin as far as it is knowable, and treatment in full words. If a lab has seen it, the certificate number is on the passport.
Current works & prices
